Having Intrusion Detection System Despite Having Anti Virus and Firewall

My comment on why need an intrusion detection system (IDS) is to prevent intruders from the system. I agree on using IDS, with the more famous, larger, and more important of a corporation’s or institution’s network, the more IDS is needed. As we enjoy the advance in information communication technology the threat level rises as well. We are no longer on the level of just using the technology but we must now include the security aspect as well. Different from the past our reliance to using the network is high. Almost everyone today store, seek, and exchange informations on The Internet. For us regular users is already a hindrance if we can’t use the service, and a stab on the chest if we lose our data. For big companies it’s a loss in profit, loss in trust, ultimately could result in destruction of the company. For example when a company makes a deal of $100.000 with the vendor via online, but an abnormality network exist whether infected by a malware, or someone exploits the vulnerability and adds an extra “zero” on the value from $100.000 to $1.000.000. That will result a great loss for the company. This is the fifth assignment from my Masters Advanced Network Security Course which has never been published anywhere and I, as the author and copyright holder, license this assignment customized CC-BY-SA where anyone can share, copy, republish, and sell on condition to state my name as the author and notify that the original and open version available here.